Well I have had a little problem with my transmission about a year ago. Where I had a leak and the hotter the transmission got (160-180 degrees) the transmission would quit working. Losing all forward gears but keeping reverse. Every time this happened I either let it cool down or re add a little more fluid and the transmission would slowly regain gears. I finally fixed the leak and the problems went away. I always though of lose of forward gears was due to low fluid and hot temps. So I fixed the leak on the pan and went on problem free for a few months in till my temp gauge reached 180+ and it happened again. I waited till it cooled down and everything returned to normal.

Now towards the end of last summer I got around to replacing my tranny cooler. Now since then normal trips I would take and have my tranny getting up to around 160+ only go to 120-140. But there's another weird thing that's happening recently. When I reach these temps 120-140 and I go into reverse I get a weird shutter when giving it gas. Only seems to happen at 1k+ rpms in reverse. All other gears world perfectly with no slippage. If I go into reverse and take is easy it acts fine. But as soon as I give it a little foot it moans and shutters (not a violent shaking of the truck shutter, just a little vibration). Its really odd. I haven't had a lost of gears since before I updated my cooler last summer.

This problem only seems to happen when its warm and the tranny reads around 120-140. When I first take the truck out during the day and go into reverse its fine. Just happens when it gets warm. I'm scared to push it hard when it does this lol. Maybe I can get a video with the noise later on.

check your parking brake. make sure it's not dragging. have had this problem in the shop a hundred times.

Will do. Today I went out for a nice drive the tranny stayed near 130. When to a friends house and tried to back up a small hill, maybe 5ft 45degr incline and the truck didn't like it at all... Started to shake a little bit so I quit didn't want to push it.

Went home and let the truck sit for about 20 minutes. The temp dropped to 110 even. Put her in reverse and backed right up a 15 foot probably about 35 degree incline. No problems at all :\ even was able to spin the tires without any shuttering or vibration.

But i will take a look at the p-bark. It only seems to do this when around 120-130 degrees.

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